Reference

Changes in aroma components of green tea during the firing process

Changes in aroma components of green tea during the firing process. Hara, Toshio; Kubota, Etsuro (Natl. Res. Inst. Tea, Shizuoka 428, Japan). Nippon Nogei Kagaku Kaishi, 58(1), 25-30 (Japanese) 1984. CODEN: NNKKAA. DOCUMENT TYPE: Journal CA Section: 17 (Food and Feed Chemistry) Volatile compds.Some commonly used reagents like 141-79-7 and 78-70-6 are used in this experiment. of green teas fired in a firing machine at 130° for 10, 20, and 30 min were prepd. by vacuum distn. and analyzed by gas chromatog. (GC) and GC-mass spectrometry for comparison with volatile compds. of nonfired green tea (raw tea). The major aroma compds. of raw tea decreased slightly during the firing process. The off-flavor compds. found in stored green tea decreased markedly during the firing process. Pyrazines, pyrroles, furans, 3,7-dimethyl-1,5,7-octatriene-3-ol [29957-43-5], and phenylacetaldehyde [122-78-1] were produced during firing. Methylpyrazine [109-08-0], 2,5-dimethylpyrazine [123-32-0], 1-ethylpyrrole-2-aldehyde [2167-14-8], 2-acetylpyrrole [1072-83-9], and furfural [98-01-1] increased markedly after firing for 30 min, and these pyrazines and pyrroles might be important volatiles in the formation of fired tea flavor. The amts. of 3,7-dimethyl-1,5,7-octatriene-3-ol and phenylacetaldehyde were higher in fired low-grade tea compared with high- and medium-grade tea. .

Catalytic effect of industrial material on volatile aromatic substances

Catalytic effect of industrial material on volatile aromatic substances. Brueckner, H.; Misselhorn, K. (Ger.). Branntweinwirtschaft, 117(11), 201-4, 206-12, 214-15 (German) 1977. CODEN: BWWSAP. DOCUMENT TYPE: Journal CA Section: 16 (Fermentations) Section cross-reference(s): 17 In a model system for food and drinks, a mixt. of glucose [50-99-7] and phenylalanine [63-91-2] were reacted at 150.degree. and 13 carbonyl compds., 11 pyrazines, 3 alcs., 2 acids, and 2 other compds. were identified in the reaction mixt. The principal components were phenylacetaldehyde [122-78-1], 3-phenylfuran [13679-41-9], benzaldehyde [100-52-7], 2,5-dimethylpyrazine [123-32-0], pyrazine [290-37-9], and methylpyrazine [109-08-0]. The dependence of formation of the latter compds on reaction temp. and time and compn. of the reacting vessel (steel, Cu, glass) was also studied.